What does CPU usage mean

CPU time is the amount of time for which a central processing unit was used for processing instructions of a computer program or operating system, as opposed to elapsed time, which includes for example, waiting for input/output operations or entering low-power mode. The CPU time is measured in clock ticks or seconds.

Explanation:

"The CPU (Central Processing Unit) is the brain of a computer and performs many of its main tasks. It processes data and delegates commands... In other words, CPU usage can be an indicator of how much stress the processor is currently undergoing, and, if necessary, what capacity is still available."

Explanation:

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